Tandem-disk harrow



. Sept. 25, 1928.

C. H. WHITE TANDEM DISK HARROW Filed on. 10, 1923 M .0. w w q t. n F Wm a n f Im A Patented Sept. 25, 1928.

UNITED STATES PATENT OFFICE.

CHARLES H. WHITE, OF MOLINE, ILLINOIS, ASSIGNOR TO DEERE & COMPANY, OF MOLINE, ILLINOIS, A CORPORATION OF ILLINOIS.

TANDEM-DISK HARROW.

Application filed October 10, 1923. Serial No. 667,661.

My invention relates to double action or tandem disk harrows. Such harrows are composed of front and rear sections pivotally connected together in tandem relation to each other, each of said sections comprising a, frame carrying a pair of gangs of soil working disks. In harrows of this description it is customary to attach the rear gang frame to the frame of the front gangs at a point above the direct line of draft that extends from the draft back to the rear gangs, and consequently the resistance offered by the rear gangs when in operation exerts a downward pressure upon the front frame and its gangs. In some fields this pressure may be suffic ent to cause the disks of the front gangs to penetrate deeper than is desired. while in other fields the soil conditions may be such that it is desirable to increase thepressure on the front gangs, and consequently the depth of penetration of the disks thereof, and the object of my invention is to provide means of adjustment by which the downward pressure on the front gangs may be varied to regulate the depth of penetration of their disks to meet the various conditions encountered in the use of the implement. This object I accomplish by providing means for varying the elevation relatively to the front frame of the point of application of the draft to the rear frame, or, in other words, for varying the vertical angular re lation of said frames to each other. The preferred embodiment of my invention is illustrated in the accompanying drawings, and is described in the following specification, but I wish it to be understood that my invention is not restricted to the construction shown and described, as it may be embodied in various other forms of apparatus.

In the accompanying drawings,

Fig. 1 is a side elevation of a tandem disk barrow embodying my invention;

Fig. 2 is a similar view with the rear gangs removed, showing the parts embodying my invention in a different position of adjustment;

Fig. 3 is a fragmentary plan view of the parts within the limits of the dotted line in Fig. 1;

Fig. 4 is a sectional detail illustrating the adjusting devices referred to; and

Fig. 5 is an enlarged sectional detail of some of the parts shown in Fig. 4.

Referring to the drawings, in which I have illustrated only such parts of a complete harrow as are necessary to a full understanding of my invention, 1 indicates one of the rear gangs and 2 one of the front gangs, all the gangs being composed of the usual style of disks assembled to form gangs in a manner well understood by those familiar with the art. The rear gangs are carried by a rear frame 3. the forward end portion of which is rigidly connected with a ose neck 4 preferably by its being bolted t ereto; as shown in Fig. 1. To the forward part of the goose neck 4 is rigidly attached a casting 5 which extends forward and is connected by a vertical pivot 6 to a U-shaped member or yoke 7 which is pivotally secured by transverse pivots 8 to a draft connection comprising vertically swinging members 9, the forward ends of which are pivotally connected to the front frame 10 so that the rear ends of said members are capable of swinging vertically. The front gangs 2 are connected with the front frame 10 in any approved way, and it will be understood that all of the gangs are capable of being adjusted to vary their angular relation to the line of progress of the machine, as is common practice. By means of the pivots 6 and 8. which as has been explained are supported by the vertically movable draft connection 9, the front and rear frames are flexibly connected so that they are capable of swinging relatively to each other either in a horizontal or in a vertical direction regardless of vertical adjustment of the rear end of said draft connection.

The front frame 10 is connected to a draft evener or the draw bar of a tractor, indicated at 11 in Figs. 1 and 2, and adjacent said connection a vertical support 12 is bolted to the frame and carries at its upper end a hearing 13 in which is journaled a tubular shaft 14 threaded rearward of the bearing 13, and having an internally threaded sleeve 15, and to the latter is attached a link 16 connected to a lever 17 rockably mounted intermediate its ends on the frame 10. To the lower end of the lever 17 is pivotally attached a bar 18 connected to the gang 2. A hand-wheel 19 is mounted on the forward end of the tubular shaft, and by its operation the latter is rotatable to angle the front gangs by moving the sleeve 15 in the desired direction. The rear gangs are angled by operation of a crank handle 20 mounted on the front end of a shaft 21 which extends rearwardly through the tubular shaft 14, and on its rear end is secured a universal joint 22 which is in like manner connected to a shaft 23. The shaft 23 is journaled in a bearing 24, on an arm 25 bolted to the goose neck 4. and has collars 26 and 27 secured on opposite sides respectively of the bearing 24 to prevent longitudinal movement of the shaft 23 therein. The rear portion of the shaft 23 is threaded and extends through a threaded bearing, not shown, secured on the upper portion of a lever 28 which is supported. intermediate its length, on the frame 3 of the rear section, and is attached at its lower end to bars 29 connected to the rear gangs. With this construction, by the operation of the crank handle 20 the rear gangs may be angled as desired regardless of the adjustment of the rear frame with respect to the front frame.

The mechanism heretofore described comprises the flexible connection of the front and rear gangs, including the transverse pivot 8, with which my improvement is more particularly cooperative. In harrows of this type the rear gang frame has usually been attached to the front frame at a fixed point and the down pressure upon the front gangs caused by the location of said fixed point above the direct line of draft, and by the resistance of the rear gangs when angled and in operation, is constant. I have found it desirable, however, to vary such pressure by vertically adjusting the connection of the front and rear gang frames in a readily operable manner. As previously stated the rocking members 9 are pivotally mounted on the front frame 10 and extend rearwardly to their pivotal connection with the part 7. A vertical screw 30 is pivotally supported at 31 on the front frame 10 and projects through a threaded sleeve 32 which extends through a suitable aperture in a yoke shaped member 33 pivotally supported on the roekable members 9. A flange 34, integral with the sleeve 32, contacts with the under surface of the member 33; above the member 33 a collar 35 is rigidly secured on the sleeve 32 by a set screw 36, and a crank handle 37 is preferably integral with the collar 35.

As shown in Figure 2 the rear frame 3 is in its lowest position and a minimum pressure would bear upon the front gangs when the harrow is operated. In Figure 1 the rear frame 3 has been raised to substantially the highest position to which it may be raised by operation of the crank handle 37, for by rotation of the latter the sleeve 32 is turned upon the screw 30, which is fixed upon the frame 10, and as the flange 34 of the sleeve operates on the under side of the yoke member 33 the latter is raised or lowered as desired, and consequently the members 9 are rocked and the rear frame, which is connected therewith as described, is raised or lowered according to direction in which the sleeve 32 is rotated. Obviously, the raising of the point of connection between the front and rear frames increases the downward pressure on the front gangs incident to the resistance offered by the rear gangs when in operation.

From the foregoing description of the parts of my improvement and their operation, it is evident that down pressure on the front gangs, caused by the force of the draft and the resistance of the rear gangs when angled and in operation, may be varied as desired by raising or lowering the point of connection between the front and rear frames.

What I claim as my invention and desire to secure by Letters Patent, is

1. A disk harrow comprising vertically swingably adjustable front and rear harrow frames, draft means connected with the front frame, means connecting said frames together in tandem relation for lateral and vertical swinging relatively to each other, and means connected with said connecting means and with one of said frames and operable to move said connecting means to vary the line of draft applied to the rear frame vertically with relation to the line of draft applied to the front frame.

2. In a disk harrow, the combination of vertically swingably adjustable front and rear harrow frames, means connecting said frames together in tandem relation for vertical swinging relatively to each other, draft means connected with the front frame, and means connected with said connecting means and with one of said frames and operable to move said connecting means to vary the elevation of the point of application of the draft by the front frame to the rear frame.

3. A disk harrow comprising vertically swingably adjustable front and rear frames, means connecting said frames togther in tandem relation for lateral and vertical swinging relatively to each other, disk gangs carried by said frames respectively, means for angularly adjusting the rear gangs from the front of the harrow, and means connected with said connecting means and with one of said frames and operable to move said connecting means to vary the vertical angular relation of said frames to each other.

4. A disk harrow comprising vertically swingably adjustable front and rear frames, vertically movable means connecting said frames together in tandem relation for lateral and vertical swinging relatively to each other, disk gangs carried by said frames respectively, and means connected with said connecting means and with one of said frames, and operable to set said frames at various vertical angles to each other.

5. A tandem disk harrow comprising front and rear frames, disk gangs carried by said frames, a vertically movable draft connection between said frames, and means connected with said draft connection and with one of said frames and operable to move said connection vertically, whereby downward pres ure on the gangs of the front frame arising from the ress-tance to the draft offered by the gangs of the rear frame may be varied.

(3. The combination with the front and rear frames of a tandem disk harrow, of a vertically swinging member carried by one of said frames and forming a draft connection with the other frame, and means for swinging said member vertically to vary the vertical angular relation of said frames to each other.

7. A disk harrow comprising in combination a front frame and disk gangs, a rear frame and disk gangs, means connecting said f ames together for lateral and vertically swinging movement relatively to each other. means supported by the front frame and operable to angularly adjust the rear gangs. and means connected with said connecting means and with one of said frames and operable to raise or lower said connecting means.

b. A disk harrow comprising in combination a front frame and disk gangs, draft means connected with said frame, a rear frame and disk gangs, a vertically swinging draft connection between said frames ar ranged to permit them to swing laterally relatively to each other, and means conneeted with said draft connection and with the front frame and operable to move said draft connection to vary vertically the line of draft applied to the rear frame with relation to the line of draft applied to the front frame.

9. In a disk harrow having in t'UIlllfiilliltlOIl a front frame and disk gangs, a rear frame and disk gangs, means connecting the frames together and adapted to be raised or lowered to vary the position of the rear frame vertically relative to the front frame, said means including a rockable member mounted on the front frame and pivotally supporting the rear frame, a screw pivotally attached to the front frame, and means on said member engaging with said screw and operable to rock said member and raise or lower the rear frame.

It). In a disk harrow having in combination a front frame and disk gangs. a rear frame and disk gangs, means connecting the frames togther and adapted to be raised or lowered to vary the position of the rear frame vertically relative to the front frame. said means including a rockable member pivotally mounted on the front frame and extending rearwardly. 11 ans supporting the rear frame on said member, a screw pivotally attached to the front frame, and a 1o tatable device secured on said member and engaging with said screw and operable to rock said member to raise or lower the rear frame.

CHARLES H. \VHITE.

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